Automotive Penetration Testing Cost and Duration: What Drives the Quote

“How much does it cost and how long will it take?” is the first question on every scoping call, and the honest answer starts with another question: what, exactly, is the target? A Hardware Security Module configuration review and a vehicle-level assessment with wireless, telematics and backend in scope are both “automotive penetration testing”, and they differ in effort by a factor of ten or more. This post lays out what actually moves the number, what the typical durations are, and how to buy the test so that the money produces evidence an assessor will accept — not a PDF.

The Seven Drivers Behind Every Quote

1. Targets and interfaces in scope

One ECU with CAN and a debug port is a small project. The same ECU with Automotive Ethernet, DoIP, a cellular modem, BLE and a companion app is a different one: each interface is its own attack surface with its own tooling, enumeration and exploitation time. Count interfaces, not boxes.

2. Access model: black-, grey- or white-box

Grey-box — schematics, debug access, partial documentation, no source — finds the most per week of effort and is the default for most programmes. White-box adds source and design documents; it costs a little more in review time and is right before a type-approval submission. Black-box best simulates an outside attacker but spends its first weeks on firmware extraction and protocol reverse-engineering, which is why it sits at the top of every duration range.

3. Scope level: component, ECU or vehicle

Component-level testing exercises one thing before integration; ECU-level puts the whole unit on the bench; vehicle-level adds gateways, lateral movement and the remote path end to end. Each level reuses the evidence below it, which is why programmes that start early and move up the levels pay less overall than those that commission one large vehicle-level test at the end. The services page describes the three levels in detail.

4. Sample units and firmware availability

Two units, one debug-unlocked, with the firmware builds and the flashing procedure, are the single cheapest way to cut a quote. A single locked unit means every destructive step — chip-off, glitching, a bricked flash — ends the engagement or waits for a replacement.

5. Bench versus on-site

Lab work on shipped hardware is the most efficient model. On-site phases — scoping, hardware work on an integration bench you cannot ship, the retest — add travel and, for European customers of an Indian provider, visa lead time. Secured remote access to your bench is the middle path for programmes whose hardware cannot leave the building.

6. Retest rounds

One retest should be in every scope; without it, findings are open at assessment time. Programmes under continuous development, where each firmware release changes a security-relevant function, are better served by a retainer than by pricing retest rounds one at a time.

7. Depth of regulatory mapping

A vulnerability list is cheap to write. A report that maps each finding to UNECE R155 Annex 5 or AIS 189 threat categories, to the TARA threat scenario it exercises, and to ISO/SAE 21434 Clauses 10, 11 and 15 — with attack feasibility input and argued non-applicability — takes engineering time, and it is the part a technical service or test agency actually reads. Buying the cheap version and asking your own team to do the mapping afterwards costs more.

Typical Durations by Scope Level

The ranges below are what we see across engagements; they assume grey-box access and the kickoff inputs described later. Black-box adds two to four weeks at every level.

What a Quote Should Itemise

Two quotes are only comparable if they describe the same work. Ask every provider for the same line items:

• Targets and interfaces — named, with the access model for each.
• Scope level — component, ECU, gateway with peers, or vehicle.
• Deliverables — findings report, coverage table against Annex 5 or AIS 189, TARA feasibility input, retest report, executive summary.
• Retest rounds included, and the price of an additional round.
• Where the work happens — lab, remote access, on-site days — and who pays for hardware shipping and travel.
• Exclusions — backend, mobile app, charging infrastructure, physical destructive testing — stated explicitly.
• Who does the work — automotive engineers who build these stacks, or a general IT team with a car module.

Levers That Cut Cost Without Cutting Evidence

• Provide two sample units, one with debug unlocked, plus firmware and the flashing procedure.
• Provide the interface description — DBC, ARXML or equivalent — and the diagnostic specification.
• Provide a TARA extract, or the OEM’s threat list if you are a supplier, so testing concentrates on the attack paths that carry risk rather than a generic sweep.
• Choose grey-box unless an assessor has asked for black-box.
• Start at component or ECU level early, so the vehicle-level test at the end is a closure exercise rather than a discovery one.
• Book the bench and the engineers who know the unit for the kickoff week; a week of waiting for access costs the same as a week of testing.

Red Flags in a Cheap Quote

A quote well below the market usually means one of three things: the scope is an IT vulnerability scan relabelled as automotive; the report will be a tool export without reproduction steps, severity reasoning or regulatory mapping; or the retest is missing. All three produce a document that fails the first question a technical service asks — show us the evidence that this mitigation was tested on this vehicle type — and the programme pays twice.

India and Europe: What Changes

The procedure does not change; the logistics do. For Indian programmes, hardware moves domestically and the team works on your bench in your time zone, which removes shipping, export-control and travel from the quote. For European programmes, the choice is shipping to the lab, secured remote access, or on-site phases planned around visa lead time — and the report is written for the technical services that report to KBA, RDW and their peers. The regional pages for India and Germany and Europe set out the practicalities for each.

Take-Aways

Scope first, price second. Count interfaces, choose grey-box, provide the kickoff inputs, insist on a retest and on regulatory mapping, and compare quotes line by line. The cheapest automotive penetration test is the one whose evidence you only have to buy once.

Agnile Technologies quotes automotive penetration testing at a fixed price after a scoping call, with standard scopes including one retest and findings mapped to UNECE R155 Annex 5, AIS 189 and ISO/SAE 21434. Durations above are typical ranges, not commitments; the scope statement is.